COMMISSION 27 OF THE I.A.U.

INFORMATION BULLETIN ON VARIABLE

Nos. 2801 - 2900

1985 October - 1986 June

EDITORS: B. SZEIDL and L.SZABADOS, KONKOLY OBSERVATORY

1525 BUDAPEST, Box 67, HUNGARY

HU ISSN 0374-0676 C O N T E N T S

2801 OBSERVATIONS OF Theta CORONAE BOREALIS IN SUMMER 1984 M. Fernandes, B.-C. Kamper, B. Nelles 1 October 1985

2802 ON THE O-C DIAGRAM AND PERIOD BEHAVIOUR OF CY Aqr B.-C. Kamper 1 October 1985

2803 FAR ULTRAVIOLET PHOTOMETRIC VARIABILITY IN Alpha Eri R.S. Polidan, G.J. Peters, R. Stalio 2 October 1985

2804 PHOTOELECTRIC EPOCHS OF MINIMUM LIGHT OF SY HOROLOGII J.R. Kern, B.B. Bookmyer 4 October 1985

2805 NEW EPHEMERIDES FOR FOUR SOUTHERN HEMISPHERE ECLIPSING BINARIES James R. Bruton, C.R. Chambliss 7 October 1985

2806 PHOTOELECTRIC MINIMA OF BZ ERIDANI R.K. Srivastava, W. Uddin 9 October 1985

2807 LIGHT VARIABILITY OF HD 220140, OPTICAL COUNTERPART OF THE X-RAY SOURCE H 2311 + 77 E. Poretti, L. Mantegazza, E. Antonello 10 October 1985

2808 THE PERIODICITY OF THE PHOTOMETRIC VARIATIONS OF HR 7671 (HD 190390) C. Waelkens, M. Burnet 14 October 1985

2809 LIGHT VARIATIONS OF THE ECLIPSING SYSTEM UV LEONIS M.A. Soliman, M.A. Hamdy, H.A. Mahdy 15 October 1985

2810 PHOTOELECTRIC LIGHT CURVES OF EH Lib M.A. Hamdy 15 October 1985

2811 PHOTOELECTRIC PHOTOMETRY OF THE W UMa TYPE VARIABLE FG HYDRAE H.A. Mahdy, M.A. Hamdy, M.A. Soliman 15 October 1985

2812 PHOTOMETRIC AND POLARIMETRIC VARIATIONS OF THE SYMBIOTIC STAR CI CYGNI R. Gravina, M.T. Martel 23 October 1985

2813 NSV 470 AND NSV 12665 J. Pfleiderer, M. Pfleiderer, B. Fuhrmann 23 October 1985

2814 REPEATED FLARE-UPS ON FLARE STARS IN NGC 7000 REGION H.S. Chavushian, I. Jankovics 28 October 1985 2815 THREE-COLOUR PHOTOELECTRIC LIGHT CURVES OF THE ECLIPSING BINARY RS VULPECULAE V. Keskin 4 November 1985

2816 NEW TIMES OF MAXIMUM LIGHT OF THE DELTA SCUTI STAR DY Peg M.A. Hobart, A. Quintero, A. Pani, R. Peniche, J.H. Pena 6 November 1985

2817 BRUN 276, A YOUNG STAR BELOW THE MAIN-SEQUENCE? E.E. Mendoza, C. Firmani, G. Haro 11 November 1985

2818 PHOTOELECTRIC LIGHT CURVE AND TIMES OF MINIMUM OF V1010 Oph M.A. Hamdy, H.A. Mahdy, M.A. Soliman 14 November 1985

2819 FLARE MONITORING OF THE ACTIVE LATE-TYPE SYSTEM YY GEMINORUM E.H. Geyer, B.-C. Kamper 15 November 1985

2820 NEW MINIMUM TIMES AND PERIOD OF SW LACERTAE P.G. Niarchos 20 November 1985

2821 PHOTOMETRY OF THE WOLF-RAYET STAR HD 191765 J.M. Vreux, J. Manfroid 21 November 1985

2822 PHOTOMETRY OF THE G8V STAR HD 192020 J.M. Vreux, J. Manfroid 21 November 1985

2823 A SEQUENCE OF COMPARISON STARS IN THE NEIGHBOURHOOD OF TT ARIETIS W. Gotz 26 November 1985

2824 THE VARIABILITY OF HD 224559 G. Hildebrandt 26 November 1986

2825 THE VARIABILITY OF ET And K.P. Panov 27 November 1985

2826 PHOTOELECTRIC OBSERVATIONS OF EV Lac IN 1984 K.P. Panov, V. Piirola, T. Korhonen 27 November 1985

2827 PHOTOELECTRIC LIGHT CURVES AND EPHEMERIS OF FM VELORUM E. Lapasset, J.J. Claria 29 November 1985

2828 1985-UBV LIGHT CURVES OF V508 OPHIUCHI E. Lapasset 29 November 1985

2829 A NEW PERIOD FOR AP SERPENTIS J.W. de Bruijn, J. Lub 3 December 1985 2830 PERIOD CHANGES IN R Leo G.R. Hoeppe 4 December 1985

2831 1984 UBVR LIGHT CURVES OF ER Vul M.J. Arevalo, J.J. Fuensalida 9 December 1985

2832 HT CASSIOPEIAE AS AN SU URSAE MAJORIS TYPE DWARF NOVA W. Wenzel 11 December 1985

2833 SUPERMINIMUM OF MV LYRAE B. Fuhrmann 11 December 1985

2834 PHOTOMETRY AND SPECTROPHOTOMETRY OF SYMBIOTIC STARS: CI Cyg, Z And, V1016 Cyg, HM Sge, HBV 475 R. Gravina 13 December 1985

2835 PHOTOELECTRIC OBSERVATIONS OF R CrB D. Bohme 17 December 1985

2836 A FURTHER UPDATE ON THE PERIOD OF V566 OPHIUCHI Michael A. Seeds, D.W. Dawson 19 December 1985

2837 IMPROVED POSITIONS OF DWARF NOVAE Carlos E. Lopez 19 December 1985

2838 PHOTOELECTRIC OBSERVATIONS OF DK CYGNI M. Paparo, M.A. Hamdy, I. Jankovics 20 December 1985

2839 HIGH SPEED PHOTOMETRY OF SS CYGNI AFTER AN OUTBURST S. Seetha, V.N. Padmini, T.M.K. Marar, K. Kasturirangan, U.R. Rao, J.C. Bhattacharyya 20 December 1985

2840 1984 UBVRI PHOTOMETRY OF II Peg M.J. Arevalo, C. Lazaro, J.J. Fuensalida 27 December 1985

2841 SOME COMMENTS ON THE MINIMA OF THE RS CVn TYPE ECLIPSING BINARIES CQ Aur, RU Cnc, VV Mon AND SZ Psc F. Scaltriti, M. Busso, A. Cellino 27 December 1985

2842 MINIMA TIMES OF GO CYGNI H. Rovithis-Livaniou, P. Rovithis 28 December 1985

2843 NEW PHOTOMETRIC OBSERVATIONS OF THE Beta CMa STARS gamma Peg, 12 Lac AND Beta Cep J.C. Valtier, E. Chapellier, P.J. Morel, J.M. le Contel 28 December 1985 2844 EVOLUTION OF THE SPECTRA OF THE SYMBIOTIC STAR Z And R. Gravina 6 January 1986

2845 OBJECTIVE-PRISM DISCOVERIES IN A REGION OF THE MILKY WAY Tsvetanka Radoslavova 7 January 1986

2846 THE VARIABILITY OF HD 17433 Joel A. Eaton, C.H. Poe 13 January 1986

2847 DISCOVERY OF AN ATMOSPHERIC ECLIPSE OF Tau Per T.B. Ake, W.S. Barksdale, R.E. Fried, J.L. Hopkins, F.C. Fekel Jr., D.S. Hall, H.J. Landis, H. Louth 14 January 1986

2848 HD 174853 - A NEW ECLIPSING BINARY Douglas P. Hube, M. Anderson 15 January 1986

2849 A NOTE ON V1286 AQUILAE Douglas P. Hube, M. Anderson 15 January 1986

2850 PHOTOELECTRIC TIMES OF MINIMUM LIGHT OF BL ERIDANI J.R. Kern, B.B. Bookmyer 20 January 1986

2851 OPTICAL BEHAVIOUR OF THE POLAR AM Her IN 1985 W. Gotz 21 January 1986

2852 NOVA SCORPII 1985 Rainer Lukas 22 January 1986

2853 IAU ARCHIVES OF UNPUBLISHED PHOTOELECTRIC OBSERVATIONS OF VARIABLE STARS (1985/6) Michel Breger 22 January 1986

2854 A POSSIBLE NEAR THE GAMMA RAY BURST SOURCE GBS 0526-66 J. Flohrer, J. Greiner 23 January 1986

2855 S 10804 Boo - RR LYRAE STAR NOW CONFIRMED S. Rossiger 28 January 1986

2856 ON THE TYPE OF VARIABILITY OF S Vul L.N. Berdnikov, G.R. Ivanov 28 January 1986

2857 PHOTOMETRY OF COMPARISON STARS Steven F. McLaughlin 31 January 1986 2858 IMPROVED EPHEMERIS FOR THE SHORT PERIOD ECLIPSING CATACLYSMIC VARIABLE V1315 AQUILAE James T. Annis 5 February 1986

2859 LQ And (HD 224559): THE 0.62-DAY (OR THE 0.31-DAY) PERIOD CONFIRMED Petr Harmanec 5 February 1986

2860 ON THE PERIOD OF YY GEMINORUM E. Zsoldos 7 February 1986

2861 REVISED ELEMENTS FOR THREE ECLIPSING BINARIES Thomas Berthold 7 February 1986

2862 AX URSAE MAJORIS G. Romano 11 February 1986

2863 BP MUSCAE - UBV LIGHT CURVE AND EPHEMERIS Zdenek Kviz 13 February 1986

2864 THE OF CR Gem Carlos E. Lopez 14 February 1986

2865 A PHOTOELECTRIC LIGHT CURVE AND PERIOD STUDY FOR CZ Aqr James R. Bruton 14 February 1986

2866 CH CYGNI IN ECLIPSE? AN APPEAL FOR OBSERVATIONS T. Tomov 17 February 1986

2867 A NEW BLUE VARIABLE STAR Mario Hamuy, J. Maza 17 February 1986

2868 THE ECLIPSING BINARY V651 CASSIOPEIAE Wenxian Lu 20 February 1986

2869 ON THE LIGHT CURVE OF AI Scl Hartmut Schneider, W. Kollatschny 25 February 1986

2870 VARIATION OF THE CP2 STAR BD +24d3675 Hartmut Schneider 25 February 1986

2871 SPECTROSCOPY OF NOVA SCORPII 1985 Tom Richtler, W. Liller 26 February 1986

2872 U CEPHEI: AN UNUSUAL DEVELOPMENT J.B. Rafert, E. Smith, N.L. Markworth 3 March 1986 2873 PHOTOELECTRIC LIGHT CURVES OF RR LEPORIS Beverly B. Bookmyer, D.R. Faulkner, R.G. Samec 3 March 1986

2874 VARIABLE STARS IN LYNDS 810 David G. Turner 6 March 1986

2875 PHOTOELECTRIC UBV OBSERVATIONS OF AQ Tau AND THE PROBLEM OF ITS PERIOD Liu Xuefu, Tan Huisong 12 March 1986

2876 PHOTOMETRIC BEHAVIOR OF HR 8752 = V 509 Cas II. E.M. Halbedel 13 March 1986

2877 A BRIGHTENING OF THE HD 46380 E.M. Halbedel 13 March 1986

2878 NEW VARIABLE STARS IN CASSIOPEIA Lennart Dahlmark 14 March 1986

2879 THE SPECTRUM OF RS OPHIUCHI 2-1/2 PRIOR TO ITS RECENT OUTBURST V.V. Smith, G. Wallerstein 14 March 1986

2880 THE HISTORICAL OPTICAL VARIATION OF DO Dra (= 3A1148+719) Martha L. Hazen 17 March 1986

2881 THE Mg II LIGHT CURVE OF AR Lac E. Derman, U. Kiziloglu, F. Tokdemir 17 March 1986

2882 SEVEN NEW VARIABLE STARS IN THE FIELD OF 2 LACERTAE H. Gessner 18 March 1986

2883 CORRECT PERIOD OF THE MIRA STAR BV CYGNI E. Splittgerber 18 March 1986

2884 THE VARIABILITY OF BD +60d562 E.M. Halbedel 24 March 1986

2885 CURRENT MICROVARIABILITY FOR THE Be STAR Phi PERSEI E.M. Halbedel 24 March 1986

2886 AH CEPHEI: A NEW PHOTOMETRIC TRIPLE STAR Pavel Mayer, M. Wolf 9 April 1986

2887 OBSERVATIONS OF W SERPENTIS STARS N.L. Markworth, R.L. Gann, J.B. Rafert, E. Smith, R.E. Wilson 10 April 1986 2888 WHERE IS AK CANIS MINORIS? R.M. Robb, T.B. Lowe, J.D. Moffatt, D.D. Balam 11 April 1986

2889 PHOTOELECTRIC OBSERVATIONS OF BY Dra IN 1984-85 Katalin Olah, M. Ivanova, L. Iliev 16 April 1986

2890 NONVARIABILITY OF SVS 1740 P. Broglia, P. Conconi 30 April 1986

2891 PHOTOMETRIC VARIABILITY OF 27 CYGNI J.R. Percy, M.G. Richer, H. Bozic, P. Harmanec, J. Horn, P. Koubsky, S. Kriz, L.A. Kelsey, D.B. Hoff, H.J. Landis, R.C. Reisenweber, R. Wasson 7 May 1986

2892 HalphaN AND HalphaW OBSERVATIONS OF THE ECLIPSING BINARY SYSTEM VV ORIONIS (HR 1868) Behrouz M. Davan 8 May 1986

2893 PHOTOELECTRIC OBSERVATIONS OF Gamma Cas, X Per AND BU Tau D. Bohme 8 May 1986

2894 PHOTOMETRIC BEHAVIOR OF DR TAURI IN THE SEASON 1985/86 W. Gotz 14 May 1986

2895 BEHAVIOR OF THE X-RAY BINARY V1727 CYGNI = 4U 2129+47 IN 1985 W. Gotz 14 May 1986

2896 THE LIGHT CURVE OF KR AURIGAE IN THE SEASON 1985/86 W. Gotz 14 May 1986

2897 RECENT MASS LOSS EPISODE OF THE Be STAR o And K.K. Ghosh, K. Jaykumar, M.J. Rosario, M. Appakutty 26 May 1986

2898 CD -30d5135 Gunnar Welin, G. Westling 29 May 1986

2899 A SECONDARY PHOTOMETRIC PERIOD OF TT ARIETIS I. Semeniuk, A. Schwarzenberg-Czerny, H. Duerbeck, M. Hoffmann, J. Tremko 30 May 1986

2900 HIGH DISPERSION SPECTROSCOPY ON TY Vir Dominique Proust 3 June 1986